Design And Environmental Performance Of Near Surface Mounted Carbon Fiber Reinforced Polymer Strips For Shear Strengthening Reinforced Concrete Bridge Girders
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Design And Environmental Performance Of Near Surface Mounted Carbon Fiber Reinforced Polymer Strips For Shear Strengthening Reinforced Concrete Bridge Girders
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Author : Jacob Hans Goebel
language : en
Publisher:
Release Date : 2011
Design And Environmental Performance Of Near Surface Mounted Carbon Fiber Reinforced Polymer Strips For Shear Strengthening Reinforced Concrete Bridge Girders written by Jacob Hans Goebel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
During the interstate expansion of the 1950s, many conventionally reinforced concrete deck girder bridges were built throughout the country. These now vintage bridges commonly exhibit diagonal cracking and rate inadequately for shear, thus they are candidates for shear strengthening to extend their useful life. Near-surface mounted (NSM) retrofitting is a promising new strengthening technique, but limited test data are available for carbon fiber reinforced polymer (CFRP) in shear strengthening making the long-term durability of NSM-CFRP unknown. This paper provides experimental results from realistic full-scale specimens strengthened with NSM-CFRP. Specimens were tested for shear strength and subjected to environmental exposures to assess long-term durability. Small cylinder specimens were tested to investigate relative performance of different adhesives on bond strength under different environmental exposures. Test results provide a better understanding of the NSM-CFRP shear behavior and strength. Recommendations for shear strength design with NSM-CFRP are made.
Design Of Frp Systems For Strengthening Concrete Girders In Shear
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Author : Abdeldjelil Belarbi
language : en
Publisher: Transportation Research Board
Release Date : 2011
Design Of Frp Systems For Strengthening Concrete Girders In Shear written by Abdeldjelil Belarbi and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Architecture categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 678: Design of FRP Systems for Strengthening Concrete Girders in Shear offers suggested design guidelines for concrete girders strengthened in shear using externally bonded Fiber-Reinforced Polymer (FRP) systems. The guidelines address the strengthening schemes and application of the FRP systems and their contribution to shear capacity of reinforced and prestressed concrete girders. The guidelines are supplemented by design examples to illustrate their use for concrete beams strengthened with different FRP systems. Appendix A of NCHRP Report 678, which contains the research agency's final report, provides further elaboration on the work performed in this project. Appendix A: Research Description and Findings, is only available online.
Strengthening And Rehabilitation Of Civil Infrastructures Using Fibre Reinforced Polymer Frp Composites
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Author : L C Hollaway
language : en
Publisher: Elsevier
Release Date : 2008-07-18
Strengthening And Rehabilitation Of Civil Infrastructures Using Fibre Reinforced Polymer Frp Composites written by L C Hollaway and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-07-18 with Technology & Engineering categories.
The repair of deteriorated, damaged and substandard civil infrastructures has become one of the most important issues for the civil engineer worldwide. This important book discusses the use of externally-bonded fibre-reinforced polymer (FRP) composites to strengthen, rehabilitate and retrofit civil engineering structures, covering such aspects as material behaviour, structural design and quality assurance. The first three chapters of the book review structurally-deficient civil engineering infrastructure, including concrete, metallic, masonry and timber structures. FRP composites used in rehabilitation and surface preparation of the component materials are also reviewed. The next four chapters deal with the design of FRP systems for the flexural and shear strengthening of reinforced concrete (RC) beams and the strengthening of RC columns. The following two chapters examine the strengthening of metallic and masonry structures with FRP composites. The last four chapters of the book are devoted to practical considerations in the flexural strengthening of beams with unstressed and prestressed FRP plates, durability of externally bonded FRP composite systems, quality assurance and control, maintenance, repair, and case studies. With its distinguished editors and international team of contributors, Strengthening and rehabilitation of civil infrastructures using fibre-reinforced polymer (FRP) composites is a valuable reference guide for engineers, scientists and technical personnel in civil and structural engineering working on the rehabilitation and strengthening of the civil infrastructure. Reviews the use of fibre-reinforced polymer (FRP) composites in structurally damaged and sub-standard civil engineering structures Examines the role and benefits of fibre-reinforced polymer (FRP) composites in different types of structures such as masonry and metallic strengthening Covers practical considerations including material behaviour, structural design and quality assurance
Seismic Performance Of Corroded Reinforced Concrete Structures Retrofitted With Frp
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Author : Dejian Shen
language : en
Publisher: Springer Nature
Release Date :
Seismic Performance Of Corroded Reinforced Concrete Structures Retrofitted With Frp written by Dejian Shen and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Performance Of Concrete Panels Strengthened Using Carbon Fiber Reinforced Polymers Cfrp
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Author : Chang Hyuk Kim
language : en
Publisher:
Release Date : 2014
Performance Of Concrete Panels Strengthened Using Carbon Fiber Reinforced Polymers Cfrp written by Chang Hyuk Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Many bridges are handling heavier loads than those expected at design, making it increasingly necessary to strengthen existing members or conduct repairs on damaged structural members. Carbon Fiber Reinforced Polymer (CFRP) materials have been broadly used to repair and strengthen reinforced concrete structures. Using CFRP materials as the strengthening material is an excellent solution because of their mechanical properties. CFRP has properties of high strength, corrosion resistance, and light weight. CFRP materials are being widely used for shear and flexural strengthening. Most studies have focused on uni-directional layout of CFRP strips in high shear regions of beams. Recent shear tests on full-scale I-girders have shown that the use of bi-directional CFRP layouts with CFRP anchors led to much higher shear strength increases than when using uni-directional layouts. The objective of the study is to determine the mechanism that governs shear strengthening of bridge girders using bi-directional CFRP and, in doing so, demonstrate the feasibility of using bi-directional CFRP for shear strengthening of large bridge I- and U-beams. Small-scale panel tests have been conducted to investigate parameters that influence the shear strength provided by bi-directional CFRP layouts. Panels were tested under compressive forces to simulate the compression struts that develop in the webs of I-beams. The applied loads generated bottle-shaped compressive struts. CFRP anchors were used to prevent early failure due to CFRP strip delamination from the panel surface. The panels, while not fully reproducing the boundary condition of girder webs, were tested ahead of full-scale girders to investigate a wide range of parameters in a cost-effective manner. The variables considered include the amount of CFRP and steel reinforcement, the inclination of CFRP fibers, and the layout and spacing of CFRP strips. The panel tests provide qualitative comparisons between the influence of the various parameters. The relative strength contributions of CFRP strips, steel stirrups, and concrete were evaluated.
Strengthening Of Reinforced Concrete Structures
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Author : L C Hollaway
language : en
Publisher: Elsevier
Release Date : 1999-03-05
Strengthening Of Reinforced Concrete Structures written by L C Hollaway and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-03-05 with Technology & Engineering categories.
The in situ rehabilitation or upgrading of reinforced concrete members using bonded steel plates is an effective, convenient and economic method of improving structural performance. However, disadvantages inherent in the use of steel have stimulated research into the possibility of using fibre reinforced polymer (FRP) materials in its place, providing a non-corrosive, more versatile strengthening system. This book presents a detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforces polymer composite plates. It is based to a large extent on material developed or provided by the consortium which studied the technology of plate bonding to upgrade structural units using carbon fibre / polymer composite materials. The research and trial tests were undertaken as part of the ROBUST project, one of several ventures in the UK Government's DTI-LINK Structural Composites Programme. The book has been designed for practising structural and civil engineers seeking to understand the principles and design technology of plate bonding, and for final year undergraduate and postgraduate engineers studying the principles of highway and bridge engineering and structural engineering. Detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforced polymer composites Contains in-depth case histories
Fatigue Performance Of Rc Beams Strengthened With Near Surface Mounted Cfrp Composites
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Author : Tamer Ghaith Mousa Eljufout
language : en
Publisher:
Release Date : 2019
Fatigue Performance Of Rc Beams Strengthened With Near Surface Mounted Cfrp Composites written by Tamer Ghaith Mousa Eljufout and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Carbon fiber-reinforced plastics categories.
Bridges have a fundamental role in improving the effectiveness of highways and providing an expedient and express traffic system. Over time, Reinforced Concrete (RC) bridges degrade due to gradually increased traffic loads and environmental deteriorations. Subsequently, service loads might cause higher stresses in concrete and steel reinforcement than stresses considered in the design stage. This affects the structural performance of RC beams and leads to sudden fatigue failure. As such, there is an essential need for rehabilitation to avoid hazards and tragedies. Carbon Fiber Reinforced Polymer (CFRP) composites are becoming widely used to strengthen RC bridges. Near Surface Mounted (NSM) technique has proven its advantages over other applied strengthening techniques. This study investigates several factors associated with the fatigue performance of RC beams strengthened with NSM CFRP reinforcement, such as: the effect of strengthening techniques on the fatigue limit of RC beams; the influence of loading history on the fatigue behavior of rehabilitated RC beams; the development of deflections, stiffness degradation, and energy dissipation of strengthened RC beams under different loading patterns; and the viability of an accelerated fatigue approach for developing a fatigue stress-life predication model of RC beams. Analytical, experimental, and numerical analyses were performed to achieve the study’s objectives. Empirical fatigue stress-life prediction models for non-strengthened and strengthened RC beams were developed based on least-squares regressions of eighty experimental data points obtained from the literature. The proposed models have a satisfactory precision for design purposes. The experimental program in this study includes eleven cast-in-place RC beams with dimensions of 152.4 × 152.4 × 1,521 mm. Specimens were tested under four-point bending configuration to simulate long-span RC beams. Monotonic tests were performed to determine the flexural static capacity, ductility index, and cracking patterns of non-strengthened and strengthened RC beams. The effect of CFRP strengthening techniques on the fatigue limit of RC beams was examined using Locati method. A non-strengthened RC beam, a RC beam strengthened with NSM CFRP reinforcement, and a RC beam strengthened with Externally Bonded (EB) CFRP sheet were tested under a step-like constant amplitude cyclic loading to failure. Accordingly, CFRP strengthening techniques increase the fatigue limit of RC beams and improve their fatigue responses. Strengthened RC beams showed less stiffness degradation and energy dissipation when compared to non-strengthened RC beams. NSM CFRP technique demonstrated a better flexural static strength and fatigue life than EB CFRP technique. Six RC beams were tested to investigate the influence of loading history on the fatigue behavior of rehabilitated RC beams. Two of the six RC beams were strengthened with NSM CFRP reinforcement and tested as a reference under constant amplitude cyclic load. To simulate the condition of service traffic loading, the other four RC beams were cyclically pre-loaded then rehabilitated with NSM CFRP reinforcement. These specimens were tested under the same loading conditions of the reference specimens. The rehabilitated pre-fatigued RC beams had stiffness degradation and failure modes similar to the reference specimens. The pre-fatigue induced an under-stressing effect that extends the fatigue life of the rehabilitated RC beams. Moreover, the post-fatigue monotonic behavior of the rehabilitated RC beams showed an increase in the elastic modulus and a decrease in ductility within the flexural static capacity. Finally, numerical analyses were performed to predict the fatigue responses of RC beams strengthened with NSM CFRP reinforcement, and to check the viability of an accelerated fatigue approach for developing a fatigue stress-life predication model. The accelerated fatigue loading has a higher rate of damage accumulation than the standard testing approach. The developed model fits the upper 95% prediction band of RC beams tested under constant amplitude cyclic loading.
Aci Structural Journal
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Author :
language : en
Publisher:
Release Date : 2008
Aci Structural Journal written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Concrete categories.
Transactions Of The American Society Of Civil Engineers
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Author : American Society of Civil Engineers
language : en
Publisher:
Release Date : 2004
Transactions Of The American Society Of Civil Engineers written by American Society of Civil Engineers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Civil engineering categories.
Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.
Fiber Reinforced Plastic Frp Reinforcement For Concrete Structures
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Author : David A. Hensher
language : en
Publisher: Elsevier
Release Date : 2016-01-22
Fiber Reinforced Plastic Frp Reinforcement For Concrete Structures written by David A. Hensher and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-01-22 with Technology & Engineering categories.
The use of fiber reinforced plastic (FRP) composites for prestressed and non-prestressed concrete reinforcement has developed into a technology with serious and substantial claims for the advancement of construction materials and methods. Research and development is now occurring worldwide. The 20 papers in this volume make a further contribution in advancing knowledge and acceptance of FRP composites for concrete reinforcement. The articles are divided into three parts. Part I introduces FRP reinforcement for concrete structures and describes general material properties and manufacturing methods. Part II covers a three-continent perspective of current R&D, design and code implementations, and technical organizations' activities. Part III presents an in-depth description of commercially-available products, construction methods, and applications. The work is intended for engineers, researchers, and developers with the objective of presenting them with a world-wide cross-section of initiatives, representative products and significant applications.